title: MDM2 promoter polymorphism and p53 codon 72 polymorphism in chronic myeloid leukemia: the association between MDM2 promoter genotype and disease susceptibility, age of onset, and blast-free survival in chronic phase patients receiving imatinib.
abstract: The genetic or functional inactivation of the p53 pathway plays an important role with regards to disease progression from the chronic phase (CP) to blast phase (BP) and imatinib treatment response in chronic myeloid leukemia (CML). Two functional single nucleotide polymorphisms (SNPs), p53 R72P and MDM2 SNP309, are associated with alternation of p53 activity, however the association regarding CML susceptibility and BP transformation under imatinib treatment is unclear. The MDM2 SNP309 genotype was determined by polymerase chain reaction-restriction fragment length polymorphism and confirmed by direct sequencing from 116 CML patients, including 104 in the CP at diagnosis, and 162 healthy Taiwanese controls. The p53 R72P polymorphism was examined in all CML patients. The SNP309 G/G genotype was associated with an increased risk of CML susceptibility (OR: 1.82, 95% CI: 1.03-3.22, P = 0.037), and an earlier age of disease onset (log-rank P = 0.005) compared with the T/T + T/G genotypes. Higher MDM2 mRNA expression was found in G/G genotype compared with T/T (P = 0.034) and T/T + T/G (P = 0.056) genotypes. No associations were found between the p53 R72P genotypes and clinical parameters and survival outcomes. Among 62 CP patients receiving imatinib as first-line therapy, the G/G genotype was associated with a shorter blast-free survival (log-rank P = 0.048) and more clonal evolution compared with the T/T + T/G genotypes. In patients with advanced diseases at diagnosis, the G/G genotype was associated with a poor overall survival (log-rank P = 0.006). Closely monitoring CML patients harboring the G/G genotype and further large-scale studies are warranted.
authors.affiliation: Division of Hematology-Oncology, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; Department of Internal Medicine, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
authors.forename: Yi-Chang
authors.initials: YC
authors.lastname: Liu
authors.forename: Hui-Hua
authors.initials: HH
authors.lastname: Hsiao
authors.forename: Wen-Chi
authors.initials: WC
authors.lastname: Yang
authors.forename: Ta-Chih
authors.initials: TC
authors.lastname: Liu
authors.forename: Chao-Sung
authors.initials: CS
authors.lastname: Chang
authors.forename: Ming-Yu
authors.initials: MY
authors.lastname: Yang
authors.forename: Pai-Mei
authors.initials: PM
authors.lastname: Lin
authors.forename: Jui-Feng
authors.initials: JF
authors.lastname: Hsu
authors.forename: Ching-Ping
authors.initials: CP
authors.lastname: Lee
authors.forename: Sheng-Fung
authors.initials: SF
authors.lastname: Lin
mesh_terms: D000328:Adult; D017668:Age of Onset; D044466:Asian People / Q000235:genetics; D001549:Benzamides / Q000627:therapeutic use; D016022:Case-Control Studies; D003062:Codon / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005838:Genotype; D006801:Humans; D000068877:Imatinib Mesylate; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000188:drug therapy / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D010879:Piperazines / Q000627:therapeutic use; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D011401:Promoter Regions, Genetic / Q000235:genetics*; D051736:Proto-Oncogene Proteins c-mdm2 / Q000235:genetics*; D011743:Pyrimidines / Q000627:therapeutic use; D016159:Tumor Suppressor Protein p53 / Q000235:genetics*
chemical_list: D001549:Benzamides; D003062:Codon; D010879:Piperazines; D011743:Pyrimidines; D016159:Tumor Suppressor Protein p53; D000068877:Imatinib Mesylate; C497206:MDM2 protein, human; D051736:Proto-Oncogene Proteins c-mdm2
keywords: MDM2; chronic myeloid leukemia; imatinib; p53; polymorphism